Ag-Mo-O ternary oxide has attracted growing attention because of its potential as a solid lubricant at high temperatures. This work designs and prepares NiCoCrAlYTa/Ag/Mo composite coating, performed using high velocity oxy-fuel (HVOF) spraying technology. The environment temperature plays an important role in the microstructure and phases as well as lubricant properties of NiCoCrAlYTa/Ag/Mo coatings. When the environment temperature is above 600 degrees C, the outer diffusion and oxidation of Ag and Mo lead to the formation of Ag2MoO4 on the coating surface. Layer-like Ag2MoO4 could form a continuous lubricant film at 800 degrees C and consequently let the composite coating present the best tribological properties. Meanwhile, a small number of hard particles could play a good bearing role during friction and improve the tribological properties of the composite coating. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.